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K2CM-Q4H Datasheet(PDF) 9 Page - Omron Electronics LLC |
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K2CM-Q4H Datasheet(HTML) 9 Page - Omron Electronics LLC |
9 / 16 page K2CM 9 LED Indicators When the motor circuit trips due to overcurrent, open-phase, or reverse-phase, the respective LED indicator lights (continuously). The overcurrent indicator also indicates the start of operation. • With the inverse-type models, when the motor current exceeds the overcurrent operating value, the overcurrent indicator blinks at the bright level and then remains lit at the dimmed level. After the oper- ating time has elapsed, with the manual resetting models, the motor circuit trips and the overcurrent indicator remains lit at the bright level, whereas with automatic resetting models, the indicator remains lit at the bright level until the motor current descends below the resetting value. • Since the indicator status is not stored in memory when the opera- tion power supply is turned OFF, be sure to check which indicators were illuminated when the motor circuit was tripped. The functions of the K2CM can be used in the following seven combi- nations. For each function, turn ON the corresponding setting switch. When the setting switches for overcurrent, open-phase, or reverse- phase function are turned OFF, the following functions becomes invalid. 1. Overcurrent Setting Switches These switches select the overcurrent setting and the multiplying fac- tor linked with operating time setting. 2. Open-phase Setting Switches These switches select the open-phase detecting function and the “High” or “Low” current imbalance factor for operation. 3. Reverse-phase Setting Switches These switches select the reverse-phase detection function and reverse-phase polarity. By selecting the reverse-phase polarity accordingly, the K2CM can operate normally without changing the connections when wired with the order of the phases reversed. If the K2CM detects reverse-phase although the motor is rotating in the forward direction (e.g., because of incorrect wiring of power lines), set the reverse-phase polarity switch to the “Reverse” position to enable normal operation. Note: The K2CM detects reverse-phase at a point before the current transformer. If a reverse connection is made at the load side far from the current transformer and the motor rotates in the re- verse direction, the K2CM does not detect the reverse-phase. Reverse-detectable Range * The reverse-phase polarity switching function is applicable to cur- rent reverse-phase detection models only. Function Overcurrent Open-phase Reverse-phase Combination 1ON 2ON 3ON 4ON ON 5ON ON 6ON ON 7 ONONON Function setting switch set to OFF Invalid function Overcurrent Time setting and multiplication Open-phase “High” and “Low” imbalance factors Reverse-phase “Forward” and “Reverse” function Overcurrent detecting function ON Enabled OFF Disabled Time setting multiplying factor × 4 (s) Time setting scale value × 4 = 8 to 40 s × 1 (s) Time setting scale value × 1 = 2 to 10 s Open-phase detecting function ON Enabled OFF Disabled Imbalance factor High The motor circuit operates at an operating imbalance factor of 35 ±10%. Low The motor circuit operates at an operating imbalance factor of 60%. Start Trip Bright Bright Dimmed Overcurrent operating value (115% of current-setting value) Motor current Reverse-phase detecting function ON Enabled OFF Disabled Reverse-phase polarity Normal The motor circuit trips at reverse- phase when a reverse-phase is detected. Reverse Used when a reverse-phase connection is made in the power line of the motor at a point before the current transformer (including external current transformer). Phase condition Normal Reverse Reverse Connections Reverse-phase polarity switch position Normal Normal Normal Trip None Yes None Direction of motor rotation Forward Reverse (See below.) Reverse Coun- ter- mea- sure Reverse- phase polarity switch position Reverse Reverse Reverse Reverse Wiring Wiring changed at (A). Wiring changed at (B). Wiring changed at (C). Wiring changed at (D). Direction of motor rotation Forward RS M T Motor relay RS T RS M T Motor relay RS T (A) (B) RS M T Motor relay RS T (C) (D) RS M T RS T Detectable: Reverse-phase state can be detected with the motor protective relay only on the power supply side. Undetectable: Reverse-phase state on the motor side cannot be detected with the motor protective relay. |
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